Chemical Screening Tests for Cystine Can Produce False-Positive Results in the Presence

Multiple Choice

Chemical screening tests for cystine can produce false-positive results in the presence of urinary ketones because:

A) Cystine is not reduced by sodium cyanide
B) Cystine should be tested using only chromatography
C) The test reagent is nitroprusside
D) Cystinuria causes diabetic ketosis